Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8d229010533831…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 04:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14e80d175f4fb9d938798d1774ffff99 SHA-1: f3c7be9e345e41f26e292ca1efef75f7689b93bc SHA-256: 1f8d2290105338313b973dc63d619fa8c3da5685687cf7c99eaf775231e4f02c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external links, many hosted on compromised or disposable domains, suggesting it functions as a link farm. The presence of ClamAV detection and ML classification as malicious, along with heuristics indicating link farms and compromised CMS uploads, strongly points to a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the links implies a redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://zge-led.com/luodan/images/userfiles/file/52566751211.pdf In PDF document text
    • http://gibisch.info/files/files/dibezujor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ca1925b1---xokev.pdfIn PDF document text
    • http://weiddy.com/uploads//files/202107301634357030.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160844676c68f4---lenuvonun.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/81104760596.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/fc4c5bfc8ce9dfb2602592651d9b5a18/90270466779.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/393561517611c22ad7be8f.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1329117b4bc3d018dd171b1f97539a53/30153131960.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2272619a2f8fa70f0c2d59ae86311592/fomawikusisejeb.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061904454666.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/79517152048.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084671f84575---95935795333.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8b6d143cc2e5ac1fa3e2061653cddca6/walagimiruwepixobogane.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775b4fa9208---vutofije.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/827ddf38e2bff36e414430f8fc8fb921/74495940515.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/72900051422.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/62152877691.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab49e5d7c6---jopeb.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/71031978610.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b09c889c2d4---6931702711.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a24a6f979a36d4aa72c883203f16df80/fumozojivemex.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/gotowimuk.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/dejopogisigu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/84attskoi99si60kd1aams6qlk/doxov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=otet+syllabus+pdf+2019PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 10916 bytes
SHA-256: b515131e94871c83947ef830db52817cc6046180ed6e458d12d00bca992558cf
font_01_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 17072 bytes
SHA-256: 4c0146b5734c615267978e52deb37a8a80d789d6d21219eb32f896024eb42dbf

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